(中南大學 資源加工與生物工程學院，長沙 410083)
摘 要: 通過菱鋅礦純礦物浮選試驗、溶液化學理論計算、動電位測試和吸附量測試，考察碳酸鈉在油酸鈉浮選菱鋅礦體系中的影響。結(jié)果表明：在堿性條件下(pH＞10)，油酸鈉浮選菱鋅礦效果較差，當pH 10.5時，碳酸鈉用量的增加能顯著改善菱鋅礦的可浮性。由泡沫穩(wěn)定性測試可知，浮選體系三相泡沫層穩(wěn)定性能隨著碳酸鈉濃度的增加而增強。結(jié)合起泡劑MIBC、松醇油實驗說明，當pH＞10時碳酸鈉調(diào)漿能顯著提高菱鋅礦礦物的可浮性很可能是起到穩(wěn)定油酸鈉泡沫層作用。
關鍵字: 菱鋅礦；碳酸鈉；油酸鈉；浮選；泡沫穩(wěn)定性
（School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:The effect of sodium carbonate on flotation system of smithsonite with sodium oleate and its mechanism were investigated through flotation experiments, calculations of solution chemistry, Zeta potential tests and adsorption tests. The results of the micro-flotation experiments indicate that the floatability of smithsonite is very low using NaOH as pH above pH 10, and increasing the concentration of sodium carbonate can improve the flotation recovery of smithsonite clearly at pH 10.5. Carbonate mainly exists in the form of CO32- ions in pH range and can’t absorb on the smithsonite surface, also can’t improve the adsorption of sodium oleate on smithsonite surface. The froth stability of sodium oleate solution results indicate that foam layer is more stabilized with the increase of sodium carbonate concentration above pH 10. The experiment results of MIBC and pine oil indicated that the froth stability behavior of sodium oleate solution above pH 10 which is more likely caused by Na2CO3 improves smithsonite’s floatability.
Key words: smithsonite; sodium carbonate; sodium oleate; flotation; froth stability
